Whisk egg yolks and sugar together until foamy.
Add mascarpone cheese and mix well.
Beat egg whites with a hand mixer until stiff peaks form.
Fold the egg white meringue into the egg yolk mixture.
Soak ladyfingers in espresso.
Layer soaked ladyfingers and cheese cream alternately in the pan.
Dust with cocoa powder.
Refrigerate for at least 3 hours.